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LT3755 Datasheet(PDF) 21 Page - Linear Technology

Part # LT3755
Description  40VIN, 75VOUT LED Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3755 Datasheet(HTML) 21 Page - Linear Technology

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LT3755/LT3755-1
21
37551fa
TYPICAL APPLICATIONS
21W Buck-Boost Mode with 250:1 PWM Dimming and Open LED Protection
VIN
LT3755
GND
SHDN/UVLO
VREF
INTVCC
499k
100k
0.1k
21.5V
1A
50V
2.2μF
2
VIN
8V TO
36V
L1
15μH
M1: VISHAY SILICONIX SI7850DP
M2: VISHAY SILICONIX SI2319DS
Q1: ZETEX FMMT558
Q2: MMBTA42
D1: DIODES INC. PDS560
L1: SUMIDA CDRH127/LD-150
93.1k
392k
1.5k
20.0k
100k
549k
75.0k
0.01μF
4.7μF
CTRL
1k
VC
4.7k
10k
4700pF
37551 TA07a
OPENLED
SS
FB
ISN
ISP
PWMOUT
PWM
PWM
SENSE
RT
GATE
100V
2.2μF
2
Q2
M2
D1
Q1
28.7K
400KHz
0.020k
VIN
Buck-Boost Mode LED Current vs Input Voltage
Buck-Boost Mode Efficiency vs Input Voltage
37551 TA07b
INPUT VOLTAGE (V)
015
10
25
30
520
35
40
80
90
100
85
95
37551 TA07c
INPUT VOLTAGE (V)
811
10
13
14
912
15
16
0.8
1
0.95
1.10
0.85
0.9
1.05



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